218 REVISION OF THE BUPRESTIDA OF THE UNITED STATES. 
more than a race of the preceding species, from which it differs only by the characters 
above noted, and by the head being entirely brassy green, and perhaps a little more deeply 
reticulated. 
13. A. flavimana, linearis nigra, opaca, subeyanescens, capite thoracisque lateribus seepe viridibus, illo 
fortius, hoc modice reticulato, latitudine parum breviore, postice angustato, lateribus antice parum angustatis, disco 
bifoveato, ante basin utrinque transversim impresso, basi medio foveato, elytris a basi angustatis, apice rotundatis, 
subtiliter rugosis, vage punctatis substriatis, interstitio discoideo magis elevato; subtus obscure viridis, tarsis anticis 
flavis vel piceis. Lon. -14—-18. 
Gory, Mon. Buprest. 4, 291; tab. 49, 285. 
Anthaxia gracilis Mels. Proc. Acad. Nat. Sc. Phil. 2, 148. 
Southern States. Varies somewhat in colour: some of the specimens are of a fuscous 
black above, with the head, sides of the thorax, and suture of the elytra dark green; in 
these the tarsi are piceous. In others, the head and sides of the thorax are of a mo- 
derately bright green, the disc of the thorax fuscous, and the elytra very dark blackish blue, 
the under surface is green, and the anterior tarsi yellow. These are the two extremes, 
but intermediate forms occur, all agreeing in the vaguely punctured and feebly striate elytra. 
14. A. bivittata “supra viridi-obscura, elongata; thorace elytrisque vittis duabus purpureis, corpore infra 
viridi.” Long. -16. 
Gory, Mon. Buprest. 4, 292; tab. 49, 286. 
Unknown to me. Seems closely to resemble the preceding in form, but the elytra are 
described as being sculptured in a squamiform manner. 
GROUP IV. 
We have the regular progression of forms here interrupted by a number of genera which 
are distinguished by the prosternum being very broad and obtuse, fitting into the emarginate 
mesosternum, which is frequently entirely connate with the metasternum; sometimes, as 
in a few species of Acmeeodera, the mesosternum is divided, but in such case the form of 
the prosternum readily distinguishes this from the two preceding groups. 
The suture between the first and segments of the abdomen, is distinct in Polycesta, ob- 
solete in the other genera. ~The mentum is entirely corneous. The ungues are usually 
simple, but in Acmeodera and Ptosima they are appendiculate. Our genera may be 
grouped: 
A. Unguiculi simplices, (scutellum distinctum.) 
Tarsi postici articulo 1mo haud elongato - - - - - Thrincopyge. 
Tarsi postici articulo Imo longiore. 
Mandibule obtusze - - - - = - Chrysophana. 
Mandibulee acutee - - - - - - Polycesta. 
